// export const hi = '你好'
let b='hahh'
function fn (a:number,b:number) {
    
}
function fn2 (this:Window) {
    console.log(this);
    
}

let box1=document.getElementById('id')
if (box1!==null) {
    box1.addEventListener('click',function () {
    
    }) 
}
